Piyush BHADE and Jyoti PHIRANI
Department of Chemical Engineering, Indian Institute of Technology Delhi, INDIA
Reservoir simulations have been used in the past to find the optimum production strategy for methane gas hydrate reservoirs. Majority of these models assume homogeneous reservoirs in the absence of substantial well test data across the field, production data and complexity of hydrate formation and dissociation processes. However, many gas hydrate reservoirs found so far are layered (Mount Elbert, block 818 in Gulf of Mexico, Walker Ridge 313 Site etc.). The cross flow between the layers and the effects of cross flow on the production are still unknown. In the present study we have studied the layered gas hydrate reservoirs using a 3-Dimentional, multiphase, multi-component, thermal simulator developed by X. Sun, 2005 to find the production strategies. Two components (hydrate, methane and water) and four phases (hydrate, gas, aqueous phase and ice) are considered in the simulator. We simulate depressurization for gas production in a confined layered hydrate reservoir underlain by an aquifer layer. The production is found to be dependent on the total volume of hydrate present, permeability contrast between the hydrate bearing layers and the aquifer layer, initial hydrate saturation, size of aquifer attached.
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